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Watt is best known for his contribution to steam engine technology. He didn't invent the steam engine but helped improve the efficiency and the cost of running steam engines, making him very successful and wealthy. In 1800, he retired and spent his time only doing research work. In his honor, the unit for measuring electricity was named after him. Watt died on Aug. 19, 1819 in Heathfield at the age of 83.